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    • 5. 发明授权
    • Network terminating terminal apparatus for integrated services digital
network
    • 用于综合业务数字网络的网络终端设备
    • US5204860A
    • 1993-04-20
    • US622631
    • 1990-12-05
    • Thomas C. Sparks
    • Thomas C. Sparks
    • H04J3/12H04Q11/04
    • H04J3/12H04Q11/0471H04Q2213/176H04Q2213/214H04Q2213/216H04Q2213/36
    • Network terminating terminal apparatus, for use in an Integrated Services Digital Network, comprises a U-interface and a S/T interface. The U-interface allows the integrated terminal apparatus to communicate with a central office directly, without a separate network terminator. Remote terminals may be connected to the network terminating terminal apparatus, via its S/T interface. The network terminating terminal apparatus then serves as a conventional network terminator. The network terminating terminal apparatus includes circuitry for controlling D-channel access by the integrated terminal apparatus. The circuitry detects the framing of the signal received at the U-interface and the D-channel information from the remote terminals and ensures that the D-channel data from the integrated terminal apparatus is supplied to the S/T interface at the appropriate time for insertion into the D-echo channel of the signal returned to the remote terminals. In addition, the D-channel data from the integrated terminal apparatus is supplied to the U interface, with the D-channel from remote terminals, for transmission in D-channel of the signal to the central office.
    • 用于综合业务数字网络的网络终端终端装置包括U接口和S / T接口。 U接口允许集成终端设备直接与中心局进行通信,而无需单独的网络终端。 远程终端可以通过其S / T接口连接到网络终端终端设备。 网络终端终端装置然后用作传统的网络终端。 网络终端终端装置包括用于控制集成终端装置的D信道接入的电路。 该电路检测在U接口接收的信号的成帧和来自远程终端的D信道信息,并确保来自集成终端设备的D信道数据在适当的时间被提供给S / T接口 插入D-echo信道的信号返回到远程终端。 此外,来自集成终端装置的D信道数据被提供给U接口,其中来自远程终端的D信道用于在信号的D信道中传输到中心局。